Ratchet type clutch device

Abstract

To provide a ratchet type clutch device that can reliably move a torque transmission portion radially outward when a pawl and a tooth mesh with each other.SOLUTION: A ratchet type clutch device has an outer ring and an inner ring, which are arranged coaxially and are rotatable relative to each other. A plurality of teeth are formed on an outer peripheral surface of the inner ring. The outer ring is provided with a plurality of pawl members that mesh with the teeth. The pawl member has: a shaft portion rotatably supported by the outer ring; a pawl portion that protrudes from the shaft portion and meshes with the tooth; and a torque transmission portion that protrudes from the shaft portion in the opposite direction to the pawl portion. An outer peripheral surface of the shaft portion has a first outer peripheral surface facing radially outward. The outer ring has an outer peripheral holding surface that faces the first outer peripheral surface, and an opposite surface that faces a tip end surface of the torque transmission portion and is spaced apart from the tip end surface. An apex that is located on the radially outmost side from the rotation center of the shaft portion is formed on the first outer peripheral surface. When the pawl portion meshes with the tooth, the pawl portion tilts with the apex abutting the outer peripheral holding surface as a fulcrum, and the tip surface of the torque transmission portion comes into contact with the opposite surface.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a ratchet-type clutch device. [Background technology]

[0002] A ratchet clutch device has an outer ring and an inner ring arranged coaxially. In the ratchet clutch device of Patent Document 1 listed below, a plurality of teeth are formed on the outer peripheral surface of the inner ring. In addition, a plurality of pawl members are provided on the outer ring. A typical pawl member has a shaft portion rotatably supported between the outer ring body and the cage, and a pawl portion that protrudes from the shaft portion and meshes with the tooth portion.

[0003] When the claws and teeth engage, if the contact area between them is small, the surface pressure on the teeth increases. If this behavior continues, the durability of the claws and teeth will be impaired. To address this issue, the claw member disclosed in Patent Document 1 below has, in addition to the shaft and claws, a torque transmission portion that protrudes from the shaft in the opposite direction from the claws. The outer ring also has an opposing surface that faces the tip end surface of the torque transmission portion and abuts against it. When the claws engage with the teeth, the tip end surface of the torque transmission portion presses against the opposing surface, transmitting torque to the outer ring. Furthermore, the opposing surface of Patent Document 1 below has a protrusion that protrudes toward the tip end surface of the torque transmission portion. This protrusion guides the pressed torque transmission portion radially outward. In other words, when the claws and teeth engage, the protrusion moves the torque transmission portion radially outward (the claw member rotates). Meanwhile, the claw on the opposite side of the torque transmission portion moves radially inward, increasing the contact area between the claws and teeth. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-197253 Summary of the Invention [Problem to be solved by the invention]

[0005] However, according to the technology of Patent Document 1, when the claw portion and the tooth portion mesh, the claw member may be pinched between the convex portion and the tooth portion, and the torque transmission portion may not move radially outward (the claw member may not rotate).

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a ratchet-type clutch device that reliably increases the contact area between the pawl portions and the tooth portions when the pawl portions and the tooth portions mesh together. [Means for solving the problem]

[0007] In order to achieve the above object, a ratchet clutch device according to one aspect of the present disclosure includes an outer ring and an inner ring arranged coaxially and rotatable relative to each other. A plurality of teeth are formed on the outer peripheral surface of the inner ring. The outer ring is provided with a plurality of pawl members that mesh with the teeth. The pawl members include a shaft portion rotatably supported by the outer ring, pawl portions that protrude from the shaft portion and mesh with the teeth, and a torque transmission portion that protrudes from the shaft portion in the opposite direction from the pawl portions. The outer peripheral surface of the shaft portion has a first outer peripheral surface that is located radially outward from the rotation center of the shaft portion. The outer ring has an outer peripheral holding surface that faces the first outer peripheral surface, and an opposing surface that faces the tip end surface of the torque transmission portion and is spaced apart from the tip end surface. The first outer peripheral surface is formed with a peak located radially outward from the rotation center of the shaft portion. When the claw portion engages with the tooth portion, the claw portion tilts with the apex abutting the outer periphery holding surface as a fulcrum, and the tip surface of the torque transmission portion comes into contact with the opposing surface. [Effects of the Invention]

[0008] According to the present disclosure, when the claw portion and the tooth portion engage, the claw member tilts with the apex as a fulcrum. In other words, the torque transmission portion moves radially outward, while the claw portion moves radially inward. This increases the contact area between the claw portion and the tooth portion. In addition, the tip surface of the torque transmission portion is spaced apart from the opposing surface. This prevents the claw member from being pinched between the protrusion and the tooth portion and preventing the claw member from tilting when the claw portion and the tooth portion engage. This reliably increases the contact area between the claw portion and the tooth portion. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing an enlarged portion of a cross section of a ratchet clutch device according to an embodiment, taken along the axial direction. [Figure 2] FIG. 2 is a schematic diagram showing a state in which the inner ring rotates relative to the outer ring in a second rotation direction in the ratchet clutch device of the embodiment. [Figure 3] FIG. 3 is a schematic diagram showing a state in which the inner ring rotates relative to the outer ring in a second rotation direction in the ratchet clutch device of the embodiment. [Figure 4] FIG. 4 is an enlarged view of the claw member and its vicinity according to the embodiment. [Figure 5] FIG. 5 is a schematic diagram of the state when the claw portion and the tooth portion come into contact with each other in the embodiment. [Figure 6] FIG. 6 is a schematic diagram of the embodiment at the time when the torque transmission portion and the opposing surface come into contact with each other. [Figure 7] FIG. 7 is a cross-sectional view of a ratchet clutch device according to another embodiment taken along the axial direction. DETAILED DESCRIPTION OF THE INVENTION

[0010] The embodiments of the present disclosure will be described in detail with reference to the drawings. The present disclosure is not limited to the contents described below. Furthermore, the components described below include those that can be easily imagined by a person skilled in the art and those that are substantially the same. Furthermore, the components described below can be combined as appropriate.

[0011] FIG. 1 is a cross-sectional view of a ratchet clutch device according to an embodiment, taken in a direction perpendicular to the axial direction, and is a partially enlarged schematic diagram. First, the basic configuration of the ratchet clutch device 100 will be described. The ratchet clutch device 100 has an annular outer ring 1 and an inner ring 2 disposed inside the outer ring 1. The outer ring 1 and the inner ring 2 are disposed coaxially and are arranged to be relatively rotatable about a central axis X. Hereinafter, the direction parallel to the central axis X will be referred to as the axial direction. Furthermore, the direction perpendicular to the central axis X will be referred to as the radial direction.

[0012] Teeth 3 projecting radially outward are formed in the circumferential direction on the outer peripheral surface of the inner ring 2. The teeth 3 have one side surface 6 facing in one circumferential direction and another side surface 7 facing in the other circumferential direction. Hereinafter, with respect to the direction of rotation (circumferential direction) about the central axis X, the direction in which the one side surface 6 faces will be referred to as a first rotational direction L1, and the direction in which the other side surface 7 faces will be referred to as a second rotational direction L2.

[0013] The outer ring 1 has an annular outer ring body 10, an annular cage 20 arranged on the inner peripheral side of the outer ring body 10, and a plurality of pawl members 40. The inner peripheral surface 11 of the outer ring body 10 is circular about the central axis X. A fitted portion 12 recessed radially outward is formed on the inner peripheral surface 11 of the outer ring body 10. The cage 20 has a cage body 21 extending along the inner peripheral surface 11 of the outer ring body 10, and a fitting portion 22 that fits into the fitted portion 12 of the outer ring body 10.

[0014] The cage body 21 and the fitting portion 22 are spaced apart from each other. The space between the cage body 21 and the fitting portion 22 forms an opening 5 for disposing a portion of the claw member 40 (claw portion 42) radially inward of the cage 20. A shaft portion accommodating portion 30 is formed between the outer ring body 10 and the cage 20 at a location adjacent to the opening 5. An extended accommodating portion 31 is formed between the outer ring body 10 and the cage 20 in the opposite direction to the opening 5 as viewed from the shaft portion accommodating portion 30. In this embodiment, the opening 5, shaft portion accommodating portion 30, and extended accommodating portion 31 are arranged in this order from the first rotational direction L1 to the second rotational direction L2.

[0015] The claw member 40 has a shaft portion 41 accommodated in the shaft portion accommodating portion 30, claw portions 42 protruding from the shaft portion 41, and a torque transmission portion 43 disposed in the expanded accommodating portion 31. The shaft portion 41 is rotatably supported in the shaft portion accommodating portion 30. The claw portions 42 pass through the opening 5 and are disposed on the inner peripheral side of the retainer 20. The claw portions 42 are constantly biased radially inward by springs 23 provided in the fitting portion 22. The torque transmission portion 43 faces an opposing surface 32 on the inner surface of the expanded accommodating portion 31. The opposing surface 32 faces the first rotational direction L1.

[0016] 2 is a schematic diagram showing a state in which the inner ring rotates relative to the outer ring in a first rotational direction L1 in the ratchet clutch device of the embodiment. As shown in Fig. 2, in the ratchet clutch device 100, when the inner ring 2 rotates relative to the outer ring 1 in the first rotational direction L1, the pawl portions 42 climb onto the tooth portions 3 or enter between the tooth portions 3, causing the pawl members 40 to swing (see arrow A1 in Fig. 2). Therefore, torque is not transmitted from the inner ring 2 to the outer ring 1.

[0017] 3 is a schematic diagram showing a state in which the inner ring rotates relative to the outer ring in the second rotational direction L2 in the ratchet clutch device of the embodiment. As shown in FIG. 3, when the inner ring 2 rotates relative to the outer ring 1 in the second rotational direction L2, the pawl portions 42, biased by the springs 23, enter between the tooth portions 3 of the inner ring 2. The pawl portions 42 then come into contact with the other side surface 7 of the tooth portion 3, pressing the pawl members 40 (see arrow A2 in FIG. 3). As a result, the torque transmission portions 43 press the opposing surface 32, and torque is transmitted to the outer ring body 10. As a result, the outer ring 1 rotates in the second rotational direction L2 at the same speed as the inner ring 2.

[0018] The above is the basic configuration of the ratchet clutch device 100. Next, the pawl member 40, the shaft receiving portion 30, and the expansion receiving portion 31 will be described in detail.

[0019] Fig. 4 is an enlarged view of the claw member and its vicinity according to the embodiment. As shown in Fig. 4, the shaft portion 41 of the claw member 40 is formed in a cylindrical shape when viewed from the axial direction to facilitate rotation. In other words, the outer peripheral surface 44 of the shaft portion 41 is formed in a circular shape with the rotation center O41 of the shaft portion 41 as the center.

[0020] The shaft portion 41 has an outer peripheral surface 44 provided with claw portions 42 and torque transmission portions 43. Therefore, the outer peripheral surface 44 is divided into a first outer peripheral surface 45 disposed radially outward from the rotation center O41 and a second outer peripheral surface 46 disposed radially inward from the rotation center O41. The outer diameter of the shaft portion 41 is larger than the width of the opening 5. This prevents the shaft portion 41 (claw members 40) from falling off from the opening 5 to the inner peripheral side of the cage 20.

[0021] A protrusion 47 that protrudes radially outward is formed on the first outer peripheral surface 45. The radially outermost portion of the protrusion 47 is referred to as an apex 48. The outer shape of the protrusion 47 is arc-shaped when viewed from the axial direction.

[0022] The inner surface of the shaft portion accommodating portion 30 is composed of the outer peripheral surface of the retainer main body 21 (hereinafter referred to as the inner peripheral holding surface 25), the corner portion 22a of the fitting portion 22, and the inner peripheral surface of the outer ring main body 10 (hereinafter referred to as the outer peripheral holding surface 13).

[0023] The inner peripheral holding surface 25 is a part of the outer peripheral surface of the cage body 21, and is formed in a position close to the opening 5. The inner peripheral holding surface 25 faces the second outer peripheral surface 46 of the shaft portion 41. The inner peripheral holding surface 25 is formed in an arc shape centered on the rotation center O41 of the shaft portion 41. A corner 22a of the fitting portion 22 faces the first outer peripheral surface 45 of the shaft portion 41. The corner 22a of the fitting portion 22 is also arc-shaped.

[0024] The outer periphery holding surface 13 is part of the inner periphery of the outer ring body 10, and extends in the second rotational direction L2 from the side surface 12a of the fitted portion 12. When viewed from the axial direction, the outer periphery holding surface 13 is formed in an arc shape centered on a center O13 of the outer periphery holding surface 13.

[0025] As shown in Fig. 4, the first imaginary line K1 is an imaginary line (straight line) drawn from the center axis X (see Fig. 1) of the outer ring 1 to one end 13a of the outer peripheral holding surface 13. The second imaginary line K2 is an imaginary line (straight line) drawn from the center axis X (see Fig. 1) of the outer ring 1 to the other end 13b of the outer peripheral holding surface 13. A convex portion 47 (apex 48) is disposed between the first imaginary line K1 and the second imaginary line K2. Therefore, the convex portion 47 (apex 48) faces the outer peripheral holding surface 13.

[0026] 4 is a virtual circle that is centered on the central axis X (see FIG. 1) of the outer ring 1 and passes through the rotation center O41 of the shaft portion 41. The center O13 of the outer peripheral holding surface 13 is located on the virtual circle K3. In other words, the center O13 of the outer peripheral holding surface 13 and the rotation center O41 of the shaft portion 41 are equidistant from the central axis X (see FIG. 1) of the outer ring 1. The center O13 of the outer peripheral holding surface 13 is displaced from the rotation center O41 of the shaft portion 41 in the first rotation direction L1. In other words, the angle formed between the center O13 of the outer peripheral holding surface 13 and the rotation center O41 of the shaft portion 41 is θ°.

[0027] The tip surface 43a of the torque transmission portion 43 faces the opposing surface 32 of the expansion accommodating portion 31. The tip surface 43a of the torque transmission portion 43 and the opposing surface 32 are spaced apart from each other. Therefore, a gap is formed between the tip surface 43a and the opposing surface 32. Furthermore, the restricting surface 33 of the expansion accommodating portion 31 is formed on the radially outer side of the torque transmission portion 43. When the torque transmission portion 43 moves radially outward, it comes into contact with the restricting surface 33, and the rotation of the claw member 40 is restricted.

[0028] In addition, to enable contact (torque transmission) between the torque transmission portion 43 and the opposing surface 32, a gap is formed between the inner surface of the shaft portion accommodating portion 30 (inner peripheral holding surface 25, corner portion 22a of the fitting portion 22, and outer peripheral holding surface 13) and the shaft portion 41.

[0029] Next, the operation of the claw portion 42 and the tooth portion 3 when they mesh will be described. Fig. 5 is a schematic diagram of the embodiment at the time when the claw portion and the tooth portion come into contact. Fig. 6 is a schematic diagram of the embodiment at the time when the torque transmission portion and the opposing surface come into contact.

[0030] As shown in FIG. 5, when the inner ring 2 rotates relative to the outer ring 1 in the second rotation direction L2, the tip end surface 42a of the claw portion 42 comes into contact with the other side surface 7 of the tooth portion 3. As a result, the claw member 40 receives a load B1 from the tooth portion 3. The direction of the load B1 is perpendicular to the other side surface 7. A gap is also formed between the tip end surface 43a of the torque transmission portion 43 and the opposing surface 32. Therefore, the claw member 40 moves in the direction of the load B1.

[0031] Here, a protrusion 47 is formed on the first outer peripheral surface 45 of the shaft portion 41. Therefore, when the claw member 40 moves in the direction of the load B1, the apex 48 of the protrusion 47 is pressed against the outer peripheral holding surface 13, and the claw member 40 tilts with the apex 48 as a fulcrum. In other words, the torque transmission portion 43 moves radially outward (see arrow B2 in FIG. 5), while the claw portion 42 moves radially inward (see arrow B3 in FIG. 5).

[0032] 6, when the tip end surface 43a of the torque transmission portion 43 comes into contact with the opposing surface 32, torque is transmitted to the outer ring body 10 (see arrow B4), and the outer ring 1 rotates in the second rotation direction L2. When the tip end surface 43a of the torque transmission portion 43 comes into contact with the opposing surface 32, the tilting of the pawl member 40 stops.

[0033] As described above, according to this embodiment, the contact area between the claw portion 42 and the tooth portion 3 is larger when the torque transmission portion 43 and the opposing surface 32 are in contact (see FIG. 6) than when the claw portion 42 and the tooth portion 3 are in contact (see FIG. 5). Therefore, the surface pressure when the tooth portion 3 and the claw portion 42 are in contact is reduced, and the durability of the claw portion 42 and the tooth portion 3 is improved.

[0034] Furthermore, a gap is formed between the torque transmission portion 43 and the opposing surface 32. This ensures a certain time from when the claw portion 42 comes into contact with the tooth portion 3 until the torque transmission portion 43 comes into contact with the opposing surface 32, i.e., a certain time for the claw member 40 to tilt. This ensures that the contact area between the claw portion 42 and the tooth portion 3 is large.

[0035] Although not shown, if the contact area between the claw portion 42 and the tooth portion 3 is already large (the torque transmission portion 43 is in contact with the restriction surface 33) when the claw portion 42 comes into contact with the tooth portion 3, the claw member 40 moves linearly in the direction of the load B1, and the tip surface 43a of the torque transmission portion 43 comes into contact with the opposing surface 32. Therefore, the claw member 40 does not tilt.

[0036] The imaginary line K4 in FIG. 5 shows the outer periphery holding surface 13 when the center O13 of the outer periphery holding surface 13 is coaxial with the rotation center O41 of the shaft portion 41. When the claw member 40 moves toward the opposing surface 32, the apex 48 may not catch on the outer periphery holding surface 13 and may slide along the outer periphery holding surface 13 (the claw member 40 may not tilt). To prevent this, in this embodiment, the center O13 of the outer periphery holding surface 13 is shifted in the first rotation direction L1 from the rotation center O41 of the shaft portion 41. This positions one end 13a of the outer periphery holding surface 13 radially inward compared to when the center O13 of the outer periphery holding surface 13 is coaxial with the rotation center O41 of the shaft portion 41 (see imaginary line K4 in FIG. 5). As a result, the protrusion 47 (apex 48) is more likely to catch on the outer periphery holding surface 13, ensuring tilting of the claw member 40. The range of the angle θ formed between the center O13 of the outer periphery holding surface 13 and the rotation center O41 of the shaft portion 41 is not particularly limited, but is preferably in the range of 0.1° to 5.0°.

[0037] Although the embodiments have been described above, the present disclosure is not limited to the examples shown in the embodiments. For example, the convex portion 47 in the embodiment has an arc-shaped shape when viewed from the axial direction, but in the present disclosure, the convex portion 47 (top portion 48) may have any shape, such as a triangle or a rectangle, as long as it serves as a fulcrum for tilting the claw member 40. In other words, the shape of the convex portion 47 (top portion 48) is not particularly important. Furthermore, although the first outer peripheral surface 45 in the embodiment also has an arc-shaped (circular) shape when viewed from the axial direction, the present disclosure is not limited thereto.

[0038] In addition, although the outer peripheral holding surface 13 in the embodiment is also arc-shaped (circular) when viewed from the axial direction, the present disclosure is not limited to this. For example, in order to make it difficult for the tops 48 of the protrusions 47 to slide when the claw portions 42 and the tooth portions 3 come into contact with each other (to ensure that the claw members 40 are tilted), the outer peripheral holding surface 13 may be formed with recesses or protrusions.

[0039] In addition, in the embodiment, to increase the reliability of tilting of the claw member 40, the center O13 of the outer peripheral holding surface 13 is disposed offset in the first rotation direction L1 from the rotation center O41 of the shaft portion 41, but the present disclosure is not limited to this. In other words, as long as the reliability of tilting of the claw member 40 is high, the center O13 of the outer peripheral holding surface 13 and the rotation center O41 of the shaft portion 41 may be coaxial.

[0040] Furthermore, in the present embodiment, an example is given of application to a ratchet clutch device (ratchet one-way clutch device) in which torque from the inner ring 2 is transmitted to the outer ring 1 only when the inner ring 2 rotates relative to the outer ring 1 in the second rotational direction L2, but the present disclosure is not limited thereto. FIG. 7 is an axial cross-sectional view of a ratchet clutch device 100A of another embodiment. For example, as shown in FIG. 7, the ratchet clutch device 100A has a plurality of first pawl members (pawl members 40) and a plurality of second pawl members 50. The first pawl members are the pawl members 40 described in the embodiment, and mesh with the toothed portions 4 from the second rotational direction L2. The second pawl members 50 mesh with the toothed portions 4 from the first rotational direction L1. Therefore, in the ratchet clutch device 100A, torque is transmitted to the outer ring 1 regardless of whether the inner ring 2 rotates relative to the outer ring 1 in the first rotational direction L1 or the second rotational direction L2 (the outer ring 1 is locked in both directions). The present disclosure may be applied to such a ratchet-type clutch device 100A. Furthermore, although the second pawl member 50 in Fig. 7 is composed only of a shaft portion and a pawl portion, the present disclosure does not particularly limit the type of second pawl member 50. Therefore, the second pawl member 50 may be a pawl member (a pawl member having the same shape as the pawl member 40) having a protrusion 47 (a peak 48).

[0041] The present disclosure may also be implemented as a combination of the following configurations. (1) The outer ring and the inner ring are arranged coaxially and are rotatable relative to each other, a plurality of teeth are formed on the outer peripheral surface of the inner ring, The outer ring is provided with a plurality of pawl members that mesh with the tooth portion, The claw member is a shaft portion rotatably supported by the outer ring; a claw portion that protrudes from the shaft portion and engages with the tooth portion; a torque transmission portion protruding from the shaft portion in a direction opposite to the claw portion; and the outer peripheral surface of the shaft portion has a first outer peripheral surface disposed radially outward from a rotation center of the shaft portion, The outer ring is an outer periphery holding surface facing the first outer periphery; an opposing surface that faces the tip end surface of the torque transmission portion and is spaced apart from the tip end surface; and The first outer peripheral surface has a top portion located radially outward from the rotation center of the shaft portion, When the claw portion engages with the tooth portion, the claw portion tilts with the apex abutting the outer peripheral holding surface as a fulcrum, and the tip surface of the torque transmission portion contacts the opposing surface. Ratchet type clutch device. (2) a direction parallel to the center axis of the outer ring is defined as an axial direction, The first outer peripheral surface is formed in an arc shape when viewed from the axial direction. A ratchet clutch device according to (1). (3) A convex portion that protrudes radially outward is formed on the first outer peripheral surface, The radially outer end of the protrusion is the apex. A ratchet clutch device according to (1) or (2). (4) a direction parallel to the center axis of the outer ring is defined as an axial direction, When viewed from the axial direction, the convex portion has an arc shape. A ratchet clutch device according to (3). (5) a virtual line drawn from the center axis of the outer ring to one end of the outer circumference support surface is defined as a first virtual line; a virtual line drawn from the center axis of the outer ring to the other end of the outer circumference support surface is defined as a second virtual line; The apex is disposed between the first imaginary line and the second imaginary line. A ratchet clutch device according to any one of (1) to (4). (6) a direction parallel to the center axis of the outer ring is defined as an axial direction, a first rotation direction being a rotation direction about the central axis and a direction in which the claw portion is arranged as viewed from the shaft portion; The outer peripheral holding surface is formed in an arc shape when viewed from the axial direction, the center of the outer peripheral support surface and the center of the shaft portion are equidistant from the central axis of the outer ring, The center of the outer periphery holding surface is disposed so as to be shifted from the center of the shaft portion in the first rotation direction. A ratchet clutch device according to any one of (1) to (5). [Explanation of symbols]

[0042] 1 outer ring 2. Inner circle 3 Teeth 5 Opening 10 Outer ring body 13 Outer retaining surface 20 Retainer 25 Inner retaining surface 30 Shaft housing 31 Expansion storage section 40 Claw member 41 Shaft 42 Claw 43 Torque transmission section 44 Outer surface 45 First outer surface 46 Second outer peripheral surface 47 Convex part 48 Top 100 Ratchet type clutch device

Claims

1. The outer ring and the inner ring are arranged coaxially and are rotatable relative to each other, a plurality of teeth are formed on the outer peripheral surface of the inner ring, The outer ring is provided with a plurality of pawl members that mesh with the tooth portion, The claw member is a shaft portion rotatably supported by the outer ring; a claw portion that protrudes from the shaft portion and engages with the tooth portion; a torque transmission portion protruding from the shaft portion in a direction opposite to the claw portion; and an outer peripheral surface of the shaft portion having a first outer peripheral surface disposed radially outward from a rotation center of the shaft portion; The outer ring is an outer peripheral holding surface facing the first outer peripheral surface; an opposing surface that faces the tip end surface of the torque transmission portion and is spaced apart from the tip end surface; and The first outer peripheral surface has a top portion located radially outward from the rotation center of the shaft portion, When the claw portion engages with the tooth portion, the claw portion tilts with the apex abutting the outer peripheral holding surface as a fulcrum, and the tip surface of the torque transmission portion comes into contact with the opposing surface. Ratchet type clutch device.

2. a direction parallel to the center axis of the outer ring is defined as an axial direction, The first outer peripheral surface is formed in an arc shape when viewed in the axial direction.

2. The ratchet clutch device according to claim 1.

3. A convex portion that protrudes radially outward is formed on the first outer peripheral surface, The radially outer end of the protrusion is the apex.

2. The ratchet clutch device according to claim 1.

4. a direction parallel to the center axis of the outer ring is defined as an axial direction, When viewed from the axial direction, the convex portion has an arc shape.

4. The ratchet clutch device according to claim 3.

5. a virtual line drawn from the center axis of the outer ring to one end of the outer periphery support surface is defined as a first virtual line; a virtual line drawn from the center axis of the outer ring to the other end of the outer periphery support surface is defined as a second virtual line; The apex is disposed between the first imaginary line and the second imaginary line. The ratchet clutch device according to any one of claims 1 to 4.

6. a direction parallel to the center axis of the outer ring is defined as an axial direction, a first rotation direction being a rotation direction about the central axis and a direction in which the claw portion is arranged as viewed from the shaft portion; The outer peripheral holding surface is formed in an arc shape when viewed from the axial direction, the center of the outer peripheral support surface and the center of the shaft portion are equidistant from the central axis of the outer ring, The center of the outer periphery holding surface is disposed so as to be shifted from the center of the shaft portion in the first rotation direction. The ratchet clutch device according to any one of claims 1 to 4.

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